/**
 * WireDrawing Test Progress
 * by Mike Shaub.  
 * 
 * This example demonstrates how to draw a line with the  
 * Traer Physics Library. It's affected by gravity and the 
 * endpoints can be moved around.
 *
 * Press 1 and 2 to select the beginning and end points then Click the mouse to move the points.
 * Press < and > to Increase and Decrease the effect of gravity on the wire.
 */

import traer.physics.*;

ParticleSystem physics;
Particle[][] particles;

int lineDetail = 10; //How many segments are calculated per line
float GravityAmt = 2.0;

void setup()
{
  size(400, 400);
  smooth();
  noFill();
  frameRate(60);

  physics = new ParticleSystem(2.0, 0.05); //(Force of gravity, Drag) Higher Gravity = pull down more, Higher Drag = Viscosity

  particles = new Particle[lineDetail][lineDetail];

  //initial position of right end
  //float gridStepX = (float) ((width / 2) / lineDetail); //original line length
  float gridStepX = (float) (random(1,width/20)); //short line

  for (int i = 0; i < lineDetail; i++) //can't delete?
  {
    for (int j = 0; j < lineDetail; j++) //can't remove?
    {
      //initial position of left end
      //particles[i][j] = physics.makeParticle(0.2, j * gridStepX + (width / 4), i + 20, 0.0);//original
      particles[i][j] = physics.makeParticle(0.2, j * gridStepX + (width / 4), i + random(height/20,height/4), 0.0);
      if (j > 0)
      {
        physics.makeSpring(particles[i][j - 1], particles[i][j], 8.0, 0.5, gridStepX);
      }
    }
  }


  particles[0][0].makeFixed();
  particles[0][lineDetail - 1].makeFixed();

}

void draw()
{
  physics.advanceTime(0.15);
  physics.setGravity(GravityAmt);

  if (mousePressed)
  {
    if (key == '1') {
      if (abs(mouseX - particles[0][0].position().x()) < 100 && abs(mouseY - particles[0][0].position().y()) < 30){
        particles[0][0].moveTo(mouseX, mouseY, 0);
        particles[0][0].velocity().clear();
      } 
    } 
    if (key == '2') {
      if (abs(mouseX - particles[0][lineDetail - 1].position().x()) < 100 && abs(mouseY - particles[0][lineDetail - 1].position().y()) < 30){
        particles[0][lineDetail - 1].moveTo(mouseX, mouseY, 0);
        particles[0][lineDetail - 1].velocity().clear();
      }
    } 
  }

  background(255);

  beginShape();
  curveVertex(particles[0][0].position().x(), particles[0][0].position().y());

  for (int j = 0; j < lineDetail; j++) //Draws width of Rows
  {
    curveVertex(particles[0][j].position().x(), particles[0][j].position().y());
  }  
  curveVertex(particles[0][lineDetail - 1].position().x(), particles[0][lineDetail - 1].position().y());
  endShape();

  //Section to draw a second similar line that hangs a little lower (WORKS)
  /*
  beginShape();
   curveVertex(particles[0][0].position().x(), particles[0][0].position().y());
   
   for (int j = 0; j < lineDetail; j++) //Draws width of Rows
   {
   curveVertex(particles[0][j].position().x(), particles[0][j].position().y()+(lineDetail/2-abs(j-lineDetail/2)));
   }  
   curveVertex(particles[0][lineDetail - 1].position().x(), particles[0][lineDetail - 1].position().y());
   endShape();
   */
}

void mouseReleased() //changing the endpoint x,y
{
  particles[0][lineDetail - 1].setVelocity( (mouseX - pmouseX), (mouseY - pmouseY), 0 );
}

void keyPressed() {
  if (key == ',' || key == '<') {
    GravityAmt--;
  }
  if (key == '.' || key == '>') {
    GravityAmt++;
  }
  physics.setGravity(GravityAmt);
  println(GravityAmt);
}